Busy-signal apparatus.



No. 885,915, A PATENTED APR. 28, 1908.

c. LBRICKSON.

BUSY SIGNAL APPARATUS. APPLICATION FILED NOV.12, 1906.

a sums-sum 1.-

' v' A PATENTBD APR. 28, 1908.

A o. JHBRIGKSON.

BUSY SIGNAL APPARATUS.

APPLICATION F ILED NOV. 12, 1906.

2 SHEETS-SHEET 2.

Q m {w :lllllillllllHv- 60257265365. fnz/zzzozr UNITED s A ns PATENT ornron CHARLES .7. ERICKSON,

, COMPANY, OF CHICAGO,

OF CHICAGO, ILLINOIS, ASSIGNOR To AUTOMATIC ELECTRIC- ILLINOIS, A CORPORATION OF ILLINOIS.

BUSY-SIGNAL APrAnATUs.

Specification of LettersPatent.

Patented. April 2$,

Application filed November 12, 1906. Serial Il'o. 343,029.

To all whom it may concern." Be it known that I, CHARLES J. ERIOKSON,

- a citizen of the United'States of America, and

resident of Chicago, Cook'county, Illinois,

have invented a certain new and useful Improvement in Busy -'Signal Apparatus, of

which the following is a specification.

My invention contemplates the combina of current-interrupters of producing .an interrupted high frequency one exchange system, or for any other purpose.

In the accompanying drawings, my improved busy signaling device, as shown in i'gure 1, com rises two polarized magnets C and D, such as are used for, harmonic ringers. In this view one coil of each magnet is removed to more clearly show the different parts. In Fig, 2 is shown a front elevation of the ma net C. Fig. 3 shows diagrammatically tl nections of my busy signaling apparatus.

- The magnets may be of any sultable type. For instance, the magnet C shown in Fig. 2 comprises-the coils 2 having the cores 3 supporting the yoke 4. Upon the yoke v .1 is secure the spring 5 to which the pendulum rod 6 is fastened. Upon the end of the said 1 pendulum rod is secured the armature17, by

means of the nut '8. The permanent magnet 9, as well as the coils 2, are secured to the frame 10, the former by means of the yoke 11. The frame 10 is mounted upon the base 12 bymeans of the posts 13; In addition the 19 which latter magnet Chas secured to the pendulum 6, by

means of the screw 14, a bracket or arm 15,

which latter clamps the s rings 16 and -17. The spring 17 is provide for stiffening or reinforcing the spring 16. The post 18 is provided for supporting the contact screw may be locked or clamped by the screw 20. ,The post 18 with the screw 19 and the springs 16 and 17 are so relatively adjusted-that when the pendulum swings to the left (Fig.2) the spring 17 bears against the spring 16 and carries the latter out of engagement with the post 19. When the pendulum swings to the right the spring 16 engages the screw 19,,while the reinforcing s ring 17 is carried out of-engagement with the spring 16. Furthermore, the pendulum rod 6 is provided with the weight-21, which ratus may bemo're clearly understood by re re magnet coils and. circuit conand to ground G. through the magnetl) extends from ground 19, pendulum rod 6, armamay be adjusted bymeans of the screw 22 up] or down the pendulum rod 6, whereby the period of vibrationwj the said pendulum may be varied. The magnet D is like the magnet C, except that the pendulum rod 6 of the former is shorter and is not provided with a weight. The pendulum of the magnet C may be'so adjusted that its. period of vibration is two strokes per second, and

the pendulum of the magnet D being very light its period of vibration is very high, like that of the armature of abuzz-er. The operation of the busy. signaling appaferring to Fig. 3 where the different coils are shown with their proper connections. When the switch 23is closedthe battery B is COll".

nected to the battery lead 24, thereby closin an energizing circuit through the magnet and also through the magnet C. This energizmg circuit for the magnet C extends from ground G contact screw 19 to the pendulum rod 6, armature 7 to the conductor 25,

through the coils 2 in series to the battery lead 24., switch 23, thence through battery B The energizing circuit G,- contact screw ture 7, conductor 26, contact screw 19 Of the magnet D, pendulum 6, armature 7 through thewindings 27 to the battery lead 24, switch 23, through the battery B and to ground G. tion operates its polarized armature 7- in such a manner that the pendulum rod 6 is carried out of engagement with the contact screw 19, thereby .breaking the, energizing circuitv through the magnets C and D. The pendulum rod then swings back. tion in engagement with the. contact screw 19, and again the energizing circuit is, es-' tablished with the same result. j

On referring to Fig. it viii be seen that when the pendulum swings to the left, and the stiffening spring 17 carries the spring 16 out of engagement withlthe contact screw 19, the energizing circuit of the said. magnet O is broken. Now when the pendulum on its return stroke reaches the osition it occupies when at rest, the sprung 16 again engages the-contact screw i r The magnet (J upon eneigma to itsnormal posi- 19,'but the pendulum, due to its momentum, swingsp'ast its normal position" to with the screw 19 for a considerable time that is, while the pendulum passes from its normal position to the right and back again.

' The magnet D, of course, energizes when the screw 19, thus bl'ealringthe energizing cirl lum rod 6 magnet D is cause cult through the said magnet D tha't is, through the windings 27. Again the endureturns to engagement with the contact screw 19, again establishing the energizing circuit, as previously explained. The pendulum rod 6 is very light in weight, and accordingly the vibrations of the rod 6'. are very fast and quite similar to that of a buzzer. This buzzer action of the magnet D continues as long as the pendulum rod 6 is in contact with the screw 19, whichcompletes the energizing circuitthrough the windings 27 of the magnet D, as explained. Obviously, then, from the foregoing, the energizing circuit of the windings 27 is intermittently opened by the magnet C. Hence the to operate intermittently. Furthermore on the same cores with the windings 27 are the secondary windings 28. Therefore, while the magnet D is operating an alternating'current is induced in the windings 28. From the terminals 29 and 30 of the secondary windings 28 the secondary current may be taken for'any desired signaling purpose.

It is evident from the foregoing that the magnet C with its slow oscillating pendulum serves as a circuit-breaker for the magnet D which, when the circuit is closed by the magnet (1, vibrates rapidly. The interruptions of the current in the windings 27 induces in the secondary windings 2 S a currentwhich is ordinarily known as a busy signaling current, as it is used in telephone systems for giving the busy signal to calling subscribers.

It will be evident that this signaling de-' vice may be used in connection with the connector disclosedin United States Patent No. 815,176, granted March 18, 1906, to Keith, Erickson & Erickson for s ipplying busy signaling current to signal the calling subscriber when a called line is busy.

The magnet coils may be wound to any suitable resistance, but with a central battery of fifty volts good results have been obtained when the windings 27 are wound to a resistance of three hundred and fifty ohms each; the windings 25 to a resistance of twenty-four ohn s each; and the windings 2 of the magnet ill to a resisranci or twelve hundred ohms or: sh.

From the ioregoiug it will I e seen that I employ a plurality of current interru ters of different rates or periods of vibration or roducing an interrupted high frequency a ,ter-' nating current suitable forv giving signals. One buzzer or interrupt-er ives a rapid vibration to the current, and then given a regular and moderate or relatively slow interruption by another buzzer or interrupter. The result, of course, is an interrupted high frequency current in thesecond'ary 28 'of the inductive connection or transformer. ceedingly efficient and satisfactory in use.

What I claim as my invention is 1. An interrupter orbuzzer for producing an interrupted current ofa relative high rate of vibration, and a second interrupter or buztively low rate ofvibration. 2. The combination of- I an interrupter or buzzer of a relatively high rate of vibration,

' another interrupter or buzzer of a relatively low rate of vibration, and means by which' interrupted hig rent. 4

3. An interrupter or buzzer, a second interrupter or buzzer, circuits for said interrupters or 'buzzers, and means by which the circuits. a I

45A plurality of current interrupters or buzzers of different rates or periods of vibraclass disclosed, means vibratory current, and a buzzer provided with interrupter contacts included in the path of said current, said buzzer being timed for a rate of vibration difi'erent from that of said current.

zer provided with interrupter contacts included in a plurality of-parallel circuits.

zer that of the current which passes through its interrupter contacts, as set forth. A i

Signed by me at Chicago, Cook county, Illinois, this 7th day of November, 1906. I

CHARLES J. ERICKSON.

Witnesses: EDWARD D. FnLEs,

JOHN Emoxsoiv.

this current 'is' I find this arrangement ex zer for interrupting the said current'at a relathe two interruplters cooperate to] produce an frequency alternating'curtion, and means by which one buzzer intermeans for producing a 7. In a device ofthe class disclosed, a buz 8, In a device of the class disclosed, a buzhaving a rate of vibration slower than second buzzer interrupts the'current of both 

